Perhaps you should try some spelling variations:
training visit » training crisis, training asia, training vet
training test » training team, training type
trading case » trading costs, trade case
dong hoang » hong hong
hua credit » dual credit, a credit, du credit
hoang yi » hoang vu, yang yi, hoang sy
yi hua » li hua, ya hua, yi hui

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: dong hoang yi hua credit ((trading case) or (((training visit) OR (training test)))) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong hoang yi hua credit ((trading case) OR (((training visit) OR (training test)))) cong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong hoang yi hua credit ((trading case) or (((training visit) OR (training test)))) cong shu ;".
• Adding a wildcard symbol may retrieve word variants: dong hoang yi hua credit ((trading case) or (((training visit) OR (training test)))) cong shu ;*.